Jack Irons (born 18 July 1962 in Los Angeles, California) was the drummer for the rock band Red Hot Chili Peppers. He was in the original band when they formed in 1983. He left Red Hot Chili Peppers to play in his other band What Is This? with his friend Hillel Slovak. He came back to the band in 1986 to record The Uplift Mofo Party Plan. In 1987, Hillel Slovak, the guitarist, died of a drug overdose. He quit the band because of this. Jack Irons has also played in many other bands, most notably Pearl Jam.